[PATCH] acpi/ghes: add TAINT_MACHINE_CHECK on GHES panic path

[Breno Leitao]

When a GHES (Generic Hardware Error Source) triggers a panic, add the
TAINT_MACHINE_CHECK taint flag to the kernel. This explicitly marks the
kernel as tainted due to a machine check event, improving diagnostics
and post-mortem analysis. The taint is set with LOCKDEP_STILL_OK to
indicate lockdep remains valid.

At large scale deployment, this helps to quickly determin panics that
are coming due to hardware failures.

Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx>
---
 drivers/acpi/apei/ghes.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index f0584ccad4519..3d44f926afe8e 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -1088,6 +1088,8 @@ static void __ghes_panic(struct ghes *ghes,
 
 	__ghes_print_estatus(KERN_EMERG, ghes->generic, estatus);
 
+	add_taint(TAINT_MACHINE_CHECK, LOCKDEP_STILL_OK);
+
 	ghes_clear_estatus(ghes, estatus, buf_paddr, fixmap_idx);
 
 	if (!panic_timeout)

---
base-commit: e96ee511c906c59b7c4e6efd9d9b33917730e000
change-id: 20250702-add_tain-902925f3eb96

Best regards,
--  
Breno Leitao <leitao@xxxxxxxxxx>